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Model GFC7000E Instruction Manual GFC7000E Documentation
04584 Rev A1 iv
6.13.1.2. Control Inputs ...................................................................................................... 116
6.13.2. Remote Operation Using the External Serial I/O............................................................... 117
6.13.2.1. Terminal Operating Modes...................................................................................... 117
6.13.2.2. Help Commands in Terminal Mode........................................................................... 118
6.13.2.3. Command Syntax ................................................................................................. 118
6.13.2.4. Data Types .......................................................................................................... 119
6.13.2.5. Status Reporting................................................................................................... 120
6.13.2.6. Remote Access by Modem ...................................................................................... 120
6.13.2.7. COM Port Password Security................................................................................... 122
6.13.2.8. APICOM Remote Control Program............................................................................ 122
6.13.3. Additional Communications Documentation ..................................................................... 123
6.13.4. Using the MGFC7000E with a Hessen Protocol Network ..................................................... 123
6.13.4.1. General Overview of Hessen Protocol ....................................................................... 123
6.13.4.2. Hessen COMM Port Configuration ............................................................................ 124
6.13.4.3. Activating Hessen Protocol ..................................................................................... 124
6.13.4.4. Selecting a Hessen Protocol Type ............................................................................ 125
6.13.4.5. Setting The Hessen Protocol Response Mode ............................................................. 126
6.13.4.6. Hessen Protocol Gas ID.......................................................................................... 126
6.13.4.7. Setting Hessen Protocol Status Flags ....................................................................... 127
6.13.4.8. Instrument ID Code .............................................................................................. 128
7. CALIBRATION PROCEDURES .................................................................................................... 129
7.1. Before Calibration................................................................................................................ 129
7.1.1. Zero Air and Span Gas................................................................................................... 129
7.1.2. Calibration Gas Traceability ............................................................................................ 130
7.1.3. Data Recording Devices ................................................................................................. 130
7.2. Manual Calibration without Zero/Span Valves .......................................................................... 130
7.3. Manual Calibration Checks .................................................................................................... 133
7.4. Manual Calibration with Zero/Span Valves............................................................................... 133
7.5. Manual Calibration Checks with Zero/Span Valves .................................................................... 137
7.5.1. Zero/Span Calibration on Auto Range or Dual Ranges......................................................... 137
7.5.2. Use of Zero/Span Valves with Remote Contact Closure ....................................................... 138
7.6. Automatic Zero/Span Cal/Check (AutoCal) .............................................................................. 139
7.6.1. AutoCal with Auto or Dual Reporting Ranges Modes Selected............................................... 142
7.7. Calibration Quality............................................................................................................... 142
8. EPA PROTOCOL CALIBRATION ................................................................................................. 143
9. MAINTENANCE SCHEDULE & PROCEDURES .............................................................................. 145
9.1. Maintenance Schedule.......................................................................................................... 145
9.2. Predicting Failures Using the Test Functions ............................................................................ 148
9.3. Maintenance Procedures....................................................................................................... 148
9.3.1. Replacing the Sample Particulate Filter............................................................................. 149
9.3.2. Rebuilding the Sample Pump .......................................................................................... 150
9.3.3. Performing Leak Checks................................................................................................. 150
9.3.3.1. Vacuum Leak Check and Pump Check ........................................................................ 150
9.3.3.2. Pressure Leak Check ............................................................................................... 150
9.3.4. Performing a Sample Flow Check..................................................................................... 151
9.3.5. Cleaning the Optical Bench............................................................................................. 151
9.3.6. Cleaning Exterior Surfaces of the MGFC7000E ................................................................... 151
10. THEORY OF OPERATION......................................................................................................... 153
10.1. Measurement Method......................................................................................................... 153
10.1.1. Beer’s Law ................................................................................................................. 153
10.1.2. Measurement Fundamentals ......................................................................................... 154
10.1.3. Gas Filter Correlation ................................................................................................... 154
10.1.4. Ambient CO
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Interference Rejection ............................................................................... 158
10.2. Pneumatic Operation.......................................................................................................... 158
10.2.1. Sample Gas Flow......................................................................................................... 159
10.2.1.1. Critical Flow Orifice ............................................................................................... 159
10.2.1.2. Sample Pressure Sensor ........................................................................................ 160
10.2.1.3. Sample Flow Sensor .............................................................................................. 160
10.2.1.4. Valve Options....................................................................................................... 161
10.2.2. Purge Gas Pressure and Flow Control ............................................................................. 161